1986
AL#5 p.7               
Michael Knutson                                                                                           

▪ Knutson makes a correction to his earlier letter about wire strength and string tension printed in AL#4 (which was a response to an article in AL#2).

1985
AL#4 p.3               
Michael Knutson                                                                                           

▪ Knutson suggests changes to a string tension formula previously published in AL#2.